Materials Literature
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We report on a study of transparent conducting tin‐doped indium oxide (ITO) electrodes in propylene carbonate solutions containing lithium ions. The system was studied using electrochemical methods in combination with in situ techniques: ultraviolet‐visible spectroscopy, X‐ray diffraction, and quartz crystal microbala…
Polyurethanes have unique mechanical and biologic properties that make them ideal for many implantable devices. However, certain polyurethanes are affected by some in vivo degradation mechanisms. For example, poly(ester)urethanes are subject to hydrolytic degradation and are no longer used in long-term implanted devic…
We report a parameter-free test of the theory predicting the critical solute concentration that destabilizes a planar solid-liquid interface in the high-velocity regime where nonequilibrium interface kinetics are important. Rapid solidification following pulsed laser melting was used to make metastable solid solutions…
ABSTRACT The foam stability properties of a defined mixed solution of Tween 20 and bovine serum albumin was evaluated as a function of arabinoxylan concentration. A marked increase in the foam stability was observed with low concentrations of arabinoxylan. Maximum improvement in the foam stability was obtained with 0.…
In-situ attenuated total reflection (ATR)-FTIR spectroscopy was used to monitor the consecutively alternating adsorption of polyethylenimine (PEI) and poly(acrylic acid) (PAC) onto both Si crystals (SiO) and CO2 plasma-treated polypropylene (PP) films. The vibration band vas(COO−) and v(CO) of PAC are diagnostic for…
Conjugated polymers that exhibit color changes on being switched between the conducting and insulating forms hold promise for applications in electrochromic devices. With the aim of increasing the electrochromic color contrast of polypyrrole/dodecylsulfate (PPy/DS) films and investigating a possible modulation of the…
5,5'-Bis(4-aminophenyl)-2,2'-bifuryl (PFDA) with a well-defined conjugation length was synthesized, and its soluble poly(amic acid) was prepared by polycondensation with pyromellitic dianhydride (PMDA). The PMDA-PFDA polyimide films were obtained from the poly(amic acid) solution through a conventional spin-casting, b…
Bis[ p -(1-oxyl-3-oxide-4,4,5,5-tetramethylimidazolin-2-yl)phenyl] nitroxide ( 3 ) was synthesized via desilylation of O -protected diradical followed by autoxidation. By deoxgenation of 3, p -(1-oxyl-4,4,5,5-tetramethylimidazolin-2-yl)phenyl- p -(1-oxyl-3-oxide-4,4,5,5-tetramethylimidazolin-2-yl)phenyl nitroxide ( 4…
The evolution of polymolecular micelles formed by two different poly(2-vinylpyridine)-polystyrene (PVP-PS) block copolymers dissolved in toluene is studied by means of transmission electron microscopy (TEM). The two PVP-PS diblock copolymers differ in composition, namely in the length of PVP block. Upon dissolution, a…
A detailed study has been undertaken on crack healing at high temperatures in a silicon nitride containing 10 wt% additives in order to identify the dominant mechanism responsible for the phenomenon. Fracture toughness increased with annealing time and the crack growth rate decreased until arrest with increasing testi…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTDirect Electrochemistry of Cofactor Redox Sites in a Bacterial Photosynthetic Reaction Center ProteinJilie Kong, Zhongqing Lu, Yuri M. Lvov, Ruel Z. B. Desamero, Harry A. Frank, and James F. RuslingView Author Information Department of Chemistry, University of Connecti…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTUnusual Conformational Change of Optically Active Poly(3-((S)-sec-butoxycarbonyl)phenyl isocyanate)Katsuhiro Maeda and Yoshio OkamotoView Author Information Department of Applied Chemistry, Graduate School of Engineering, Nagoya Uni…
Isolated clusters of Pb94- with the shape of monocapped square antiprisms are found in Cs4Pb9 made by direct fusion of the elements. A “close-packed” layer of clusters viewed along c of the monoclinic cell is shown to the right (b is vertical).
We present epitaxial growth, structures, magnetization, magneto-transport, and magneto-optic properties of (GaMn)As thin films and (GaMn)As/AlAs superlattice heterostructures grown by molecular beam epitaxy (MBE) on GaAs substrates. (Ga1−xMnx)As is a new class of III–V based magnetic alloy semiconductor grown by low t…
n-Hexane conversion over zeolite-supported platinum catalysts has been studied at 360°C in a packed bed reactor. In the absence of sulfur impurities, the deactivation appears to be due to two types of coke formation. The propensity for terminal hydrogenolysis is primarily determined by the particle morphology, i.e., t…
A solidification front advancing into a three-dimensional (3D) medium containing mobile impurities is implemented as a model for a semilate stage dynamical process at a first-order phase transition under the isothermal undercooling condition. The approach generalizes the dynamical epidemic model to 3D. The presence of…
Impacts of rigid spherical nose shaped missiles on concrete beams are simulated with a discrete element method. The history of the structural damage of the beam is followed from the very first crushing and fracturing processes to the ultimate fragmentation step. Spalling, scabbing, penetration and perforation events a…
The properties of zirconia cubic solid solutions doped with yttria, erbia, and ceria or thoria are investigated with emphasis on the potential use of this material as an inert matrix for Pu incineration in a light water reactor. The material is selected on the basis of its neutronic and chemical properties; Zr and Y a…
A variable duty cycle pulsed plasma was employed to synthesize polymeric films from pentafluorostyrene monomer. The physical properties of the resultant films are observed to vary in progressive fashion with changes in the plasma duty cycles employed during deposition, all other plasma variables remaining constant. Th…
We report the observation of new pattern formation by spherical polystyrene particles trapped at the air-water interface; namely, the formation of two-dimensional void, soap-froth, and cluster structures. The formation of the soap-froth structure depends upon the initial surface concentration of particles. The void an…